The trace mode controls how many analog
channels to capture and what type of timebase to use. It also applies an optional
pre and/or post trigger delay to allow data before and/or
after to trigger to be captured.

Five registers are used to program the trace mode:

R8

Trace Register

Trace mode selection.

R11

Post Trigger Delay

Delay after trigger (low byte).

R12

Post Trigger Delay

Delay after trigger (high byte).

R13

Time-base Expansion

Time-base expansion factor.

R20

Pre-Trigger Delay

Buffer prefill before trigger.

The most important trace mode register is the Trace
RegisterR8. The low 4 bits of this register are
programmed to with a Trace ID to select one of 6
available modes: